(B) . The upper surface of the wing is more curved than its lower surface; therefore,the speed of air above the wings is larger than the speed of the

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Force due to the pressure difference between the upper and lower surfaces of the wings,created by different air speeds on the surface

(B) . The upper surface of the wing is more curved than its lower surface; therefore,the speed of air above the wings is larger than the speed of the air below the wings.According to Bernoulli's theorem,the pressure above the wings becomes less than the pressure below the wings.Due to this difference of pressure on the two sides of the wings,a vertical lift acts on the aeroplane.When this lift is sufficient to overcome the gravitational pull on the aeroplane,the aeroplane is lifted up and sustained in flight.

Class 11 Physics Fluid Mechanics and Surface Tension Bernoulli's Theorem and Applications of Bernoulli's Theory

Easy

The weight of an aeroplane flying in air is balanced by

A
Upthrust of the air which will be equal to the weight of the air having the same volume as the plane
B
Force due to the pressure difference between the upper and lower surfaces of the wings,created by different air speeds on the surface
C
Vertical component of the thrust created by air currents striking the lower surface of the wings
D
Force due to the reaction of gases ejected by the revolving propeller

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Class 11 Questions

Class 11

Physics Questions

Chapter

Fluid Mechanics and Surface Tension

Subtopic

Bernoulli's Theorem and Applications of Bernoulli's Theory

An aeroplane of mass $3 \times 10^4 \, kg$ and total wing area of $120 \, m^2$ is in a level flight at some height. The difference in pressure between the upper and lower surfaces of its wings in kilopascals is $(g = 10 \, m/s^2)$.

Easy

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Water flows through the tube shown. The cross-sectional areas of the wide and narrow parts are $5 \text{ cm}^2$ and $2 \text{ cm}^2$,respectively. The rate of flow is $500 \text{ cm}^3/\text{s}$. Find the difference in the mercury level of the $U$-tube in $\text{cm}$.

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$A$ liquid is flowing in a horizontal pipe of non-uniform cross-section. Which of the following quantities may remain unchanged with respect to time?

Easy

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Water from a tap emerges vertically downwards with an initial velocity of $4 \,m/s$. The cross-sectional area of the tap is $A$. The flow is steady and the pressure is constant throughout the stream of water. The distance $h$ vertically below the tap,where the cross-sectional area of the stream becomes $\frac{2}{3} A$,is (take $g = 10 \,m/s^2$): (in $\,m$)

DifficultTS EAMCET 2010

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Water is flowing with a velocity of $2 \ m/s$ in a horizontal pipe where the cross-sectional area is $2 \times 10^{-2} \ m^2$ at a pressure of $4 \times 10^4 \ Pa$. The pressure at a cross-section of area $0.01 \ m^2$ in Pascal will be:

Medium

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The weight of an aeroplane flying in air is balanced by

Similar Questions

An aeroplane of mass $3 \times 10^4 \, kg$ and total wing area of $120 \, m^2$ is in a level flight at some height. The difference in pressure between the upper and lower surfaces of its wings in kilopascals is $(g = 10 \, m/s^2)$.

Water flows through the tube shown. The cross-sectional areas of the wide and narrow parts are $5 \text{ cm}^2$ and $2 \text{ cm}^2$,respectively. The rate of flow is $500 \text{ cm}^3/\text{s}$. Find the difference in the mercury level of the $U$-tube in $\text{cm}$.

$A$ liquid is flowing in a horizontal pipe of non-uniform cross-section. Which of the following quantities may remain unchanged with respect to time?

Water is flowing with a velocity of $2 \ m/s$ in a horizontal pipe where the cross-sectional area is $2 \times 10^{-2} \ m^2$ at a pressure of $4 \times 10^4 \ Pa$. The pressure at a cross-section of area $0.01 \ m^2$ in Pascal will be:

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